chore(CHANGELOG): 🔊 created a skeleton changelog for use when creating releases

Author: amyheather

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). Dates formatted as YYYY-MM-DD as per [ISO standard](https://www.iso.org/iso-8601-date-and-time-format.html).
+
+## Unreleased - Date - DOI
+
+🌱 Initial release of tutorial materials.
+
+### Added
+
+* TBC